ASNT RT II Questions and Answers Already Passed

ASNT RT II Questions and Answers Already Passed low voltage x-ray tubes are generally fitted with windows made of: beryllium a monochromatic x-ray beam is: a beam consisting of a single wavelength the general method of producing x-rays involves the sudden deceleration of high velocity electrons in a solid body called a: target if it were necessary to radiograph a 7" thick steel product, which gamma ray source would most likely be used? co-60 a co-60 gamma source has an approximate practical thickness limit of: 9" of steel or its equivalent the absorption of gamma rays from a given source when passing through matter depends on the: atomic number, density, and thickness of the matter the fact that gases, when bombarded by radiation ionize and become electrical conductors make them useful in: radiation detection equipment the velocity of electrons striking the target in an x-ray tube is a function of the: voltage difference between the cathode and anode the uneven distribution of developed grains within the emulsion of a processed x-ray film causes the subjective impression of: graininess the gamma ray intensity at 1 ft from a 1 Ci source of radioactive co-60 is nearest to: 15 R/h the focal spot in an x-ray tube: should be as small as possible without unduly shortening the life of the tube in an x-ray tube, the filament and focusing cup are the two essential parts of the: cathode the quantity of radiation which will produce, by means of ionization, one electrostatic unit of electricity in 0. g of dry air is known as a: Roentgen the specific activity of an isotopic source is usually measured in: curies per gram (Ci/g) which isotope has the longest half-life? Cs- 137 the primary form of energy conversion when electrons strike a target in an x-ray tube results in the production of: heat the slope of a straight line joining two points of specified densities on a characteristic curve of a film is known as the: average gradient an